I build a new just 3 weeks ago when my tax-return came (and subsequently, had any reasonable amount of money to spend) with only the PSU, monitor, speakers & keyboard/mouse remaining from the old set-up. (I plan on adding 1 of my 2 older HDD's in the box but haven't gotten around to it yet.)
Since I'm looking for any excuse of showing the specs around this is what I have now:
CPU: Intel Core i5 750 @ factory speed ( 2.67Mhz)
Mobo: Asus P7P55D LE
RAM: Kingston 6GB 1333MHZ DDR3
GPU: Asus ATI Radeon 5770.v2 (the smaller cooler casing one)
PSU: LC-Power Giant v2.0 Green Power 550w
Case: Nexus Clodius White
and around 1 terabytes of HDD's altogether with all the old pheriperials.
It's pretty sweet rig. Not perfect (see also: PSU) but it works, and well.